含肉桂醛和 ZnO 纳米粒子的抗菌明胶基薄膜，用于可持续的食品包装。
Antimicrobial gelatin-based films with cinnamaldehyde and ZnO nanoparticles for sustainable food packaging.
机构信息
Packaging Materials Department, National Research Centre, 33 El-Behouth St., P.O.12622, Dokki, Cairo, Egypt.
Pre-Treatment and Finishing of Cellulosic Fibres Department, National Research Centre, 33 El-Behouth St., P.O.12622, Dokki, Cairo, Egypt.
出版信息
Sci Rep. 2024 Sep 28;14(1):22499. doi: 10.1038/s41598-024-72009-7.
Cinnamaldehyde (CIN), a harmless bioactive chemical, is used in bio-based packaging films for its antibacterial and antioxidant properties. However, high amounts can change food flavor and odor. Thus, ZnO nanoparticles (NPs) as a supplementary antimicrobial agent are added to gelatin film with CIN. The CIN/ZnO interactions are the main topic of this investigation. FTIR-Attenuated Total Reflection (ATR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were utilized to investigate CIN/ZnO@gelatin films. Transmission electron microscope (TEM) images revealed nanospheres morphology of ZnO NPs, with particle sizes ranging from 12 to 22 nm. ZnO NPs integration increased the overall activation energy of CIN/ZnO@gelatin by 11.94%. The incorporation of ZnO NPs into the CIN@gelatin film significantly reduced water vapour permeability (WVP) of the CIN/ZnO@gelatin film by 12.07% and the oxygen permeability (OP) by 86.86%. The water sorption isotherms of CIN/ZnO@gelatin were described using Guggenheim-Anderson-de Boer (GAB) model. The incorporation of ZnO NPs into the CIN@gelatin film reduced monolayer moisture content (M) by 35.79% and significantly decreased the solubility of CIN/ZnO@gelatin by 15.15%. The inclusion of ZnO into CIN@gelatin film significantly decreased tensile strength of CIN/ZnO@gelatin by 13.32% and Young`s modulus by 18.33% and enhanced elongation at break by 11.27%. The incorporation of ZnO NPs into the CIN@gelatin film caused a significant decrease of antioxidant activity of CIN/ZnO@gelatin film by 9.09%. The most susceptible organisms to the CIN/ZnO@gelatin film included Candida albicans, Helicobacter pylori, and Micrococcus leutus. The inhibition zone produced by the CIN/ZnO@gelatin film versus Micrococcus leutus was 25.0 mm, which was comparable to the inhibition zone created by antibacterial gentamicin (23.33 mm) and cell viability assessment revealed that ZnO/CIN@gelatin (96.8 ± 0.1%) showed great performance as potent biocompatible active packaging material.
肉桂醛（CIN）是一种无害的生物活性化学物质，因其具有抗菌和抗氧化特性而被用于生物基包装薄膜。然而，高浓度的 CIN 可能会改变食物的味道和气味。因此，将氧化锌纳米粒子（NPs）作为补充抗菌剂添加到含有 CIN 的明胶膜中。CIN/ZnO 的相互作用是本研究的主要主题。傅里叶变换衰减全反射（ATR）、X 射线衍射（XRD）和扫描电子显微镜（SEM）用于研究 CIN/ZnO@明胶薄膜。透射电子显微镜（TEM）图像显示 ZnO NPs 的纳米球形态，粒径范围为 12-22nm。ZnO NPs 的加入使 CIN/ZnO@明胶的总活化能增加了 11.94%。将 ZnO NPs 掺入 CIN@明胶薄膜中，显著降低了 CIN/ZnO@明胶薄膜的水蒸气透过率（WVP）12.07%和氧气透过率（OP）86.86%。CIN/ZnO@明胶的水分吸附等温线采用古根海姆-安德森-德博（GAB）模型进行描述。将 ZnO NPs 掺入 CIN@明胶膜中，使 CIN/ZnO@明胶的单层水分含量（M）降低了 35.79%，并显著降低了 CIN/ZnO@明胶的溶解度 15.15%。将 ZnO 掺入 CIN@明胶薄膜中，使 CIN/ZnO@明胶的拉伸强度降低了 13.32%，杨氏模量降低了 18.33%，断裂伸长率提高了 11.27%。将 ZnO NPs 掺入 CIN@明胶膜中，使 CIN/ZnO@明胶的抗氧化活性显著降低了 9.09%。对 CIN/ZnO@明胶膜最敏感的生物体包括白色念珠菌、幽门螺杆菌和微球菌。CIN/ZnO@明胶膜对微球菌产生的抑菌圈为 25.0mm，与抗菌庆大霉素（23.33mm）产生的抑菌圈相当，细胞活力评估显示 ZnO/CIN@明胶（96.8±0.1%）作为一种有前途的生物相容性活性包装材料具有出色的性能。
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